/Engine/Source/Editor/GameProjectGeneration/Public/GameProjectUtils.h
Opens the code editing IDE for the specified project, if it exists. Returns true if the IDE could be opened. On failure, OutFailReason will be populated.
static bool OpenCodeIDE ( const [FString](API\Runtime\Core\Containers\FString) & ProjectFile, [FText](API\Runtime\Core\Internationalization\FText) & OutFailReason )